이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int M = 1e9+9;
int32_t main() {
ios::sync_with_stdio(0), cin.tie(0);
int N, D, res = 1, j = 0;
cin >> N >> D;
int a[N]; for(int &i : a) cin >> i;
sort(a, a + N);
for(int i = 0; i < N; ++i) {
while(a[j] + D < a[i]) ++j;
(res *= i - j + 1) %= M;
}
cout << res;
}
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